It took me an embarrassingly long 15 minutes in Python. I had already seen the mention of recursion in the description, so I hope I would have realized that it

It took me an embarrassingly long 15 minutes in Python. I had already seen the mention of recursion in the description, so I hope I would have realized that it was needed. (I am guessing I probably would have looked at recursion at the point when I realized that there were multiple levels of nesting, and not just one).